536 Mr. H. B. Preston on new 



condition white, vitreous, shining ; whorls 4, regularly in- 

 creasing, radiately finely costulate ; suture impressed ; base 

 of shell sculptured with revolving stria3 ; umbilicus narrow, 

 deep, well-like ; columella margin obliquely descending ; 

 aperture somewhat compressedly sublimate, armed with four 

 erect plaits, of which two are on the parietal wall, one below 

 the other, and two on the outer wall, similarly situated. 



Alt. '25, diam. maj. 1 mm. 



Hab. Limestone Quarry, S.E. coast of Norfolk Island, 

 where it occurs in a subfossil state (R. Bell). 



Succinea humerosa, sp. n. 



Shell allied to S. norfolkensis, Sykes *, but differing from 

 that species in being rather narrower in form and in having 

 the last two whorls conspicuously shouldered above and below ; 

 the aperture is also rather longer and narrower than in 

 S. norfolkensis. 



Alt. 13"5, diam. maj. 8*5, diam. min. 5 mm. 



Aperture : alt. 8, diam. 5 mm. 



Hab. Nepean Island, in a subfossil state only. 



Succinea nepeanensis, sp. n. 



Shell elongate, whorls 3, rapidly increasing, moderately 

 convex, the last very long ; suture well impressed ; columella 

 margin curved, narrowly calloused ; labrum simple, some- 

 what bent inwards over the aperture above ; aperture ovate. 



Alt. 14'75, diam. maj. 7*25, diam. min. 5"5 mm. 



Aperture : alt. 9'25, diam. 5*75 mm.. 



Hab. Nepean Island, in a subfossil condition only (R. 

 Bell). 



Tornatellina norfolkensis, sp. n. 



Shell subulately cylindrical, thin, fragile, semitransparent, 

 smooth, polished, shining, pale reddish brown ; whorls 6, 

 the first very small, the second proportionately large, the 

 remainder regularly increasing, marked only with irregular 

 growth-plica? ; suture impressed, very narrowly margined 

 below, columella whitish, developed into a rather twisted, 

 inwardly projecting fold, and extending above into a light, 

 well-defined, and somewhat restricted parietal callus, which 

 reaches to the upper margin of the labrum; labrum simple; 

 aperture inversely auriform, bearing a single, curved, erect, 

 white, entering, parietal lamella. 



Alt. 3*5, diam. maj. 1*25 mm. 



Hab. Ball's Bay, Norfolk Island (/?. Bell). 



* Proc. Malac. Soc. London, iv. L900, p. 144, pi. xiii. fig. 12. 



